130806309 has 4 divisors (see below), whose sum is σ = 174408416. Its totient is φ = 87204204.

The previous prime is 130806283. The next prime is 130806331. The reversal of 130806309 is 903608031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903608031 = 3 ⋅301202677.

It is not a de Polignac number, because 130806309 - 2¹⁵ = 130773541 is a prime.

It is a super-2 number, since 2×130806309² = 34220580948406962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130806349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21801049 + ... + 21801054.

It is an arithmetic number, because the mean of its divisors is an integer number (43602104).

Almost surely, 2^130806309 is an apocalyptic number.

It is an amenable number.

130806309 is a deficient number, since it is larger than the sum of its proper divisors (43602107).

130806309 is an equidigital number, since it uses as much as digits as its factorization.

130806309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43602106.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 130806309 is about 11437.0585816459. The cubic root of 130806309 is about 507.6248767740.

The spelling of 130806309 in words is "one hundred thirty million, eight hundred six thousand, three hundred nine".